It is pretty easy to learn how to customize your Twitter background. There are several tutorials on the net today that teach you how to create your own personalized homepage but most we will do a basic Twitter background. The blog will look like this one here when it is complete.
As far as creating the main background page, you can use any image creator. A lot of people use Paint.net but the choice is up to yours if you are already using one. Start with a blank page that is 1900 pixels by 1600 pixels. The 1900 is the width and the 1600 is the height. If you use a smaller dimension you would have blank spaces along your page and of course if you used a larger one, you would have parts of your page missing.
For the header, it should be exactly 100 pixels in height because that is the only size that will line up correctly with the rest of the page. Anything else will make your page look a bit off.
The Sidebar can be anywhere between 200 pixels and 250 pixels wide depending on how much space you would like between the tweets and the profile sidebar. As far as the height, it should be between 350 Pixels and 450 pixels. With the sidebar, you have a more play room to try different thing and see what works best for you and your Twitter background.
If you are having a tough time creating the sidebar with your image creator, you can try doing it with HTML. This way you can have different fonts and colors for the text. HTML is fairly easy to learn and there are hundreds of tutorials online to learn it. Once you know HTML, the possibilities are endless as to what you can do with it.
So once have you have everything in place, you need to save it as an entire image and then set it up as a background for your Twitter profile. It is important to remember when you are learning how to customize your Twitter background; you need to keep the image under 800 Kbs since this is the only sizing that Twitter will allow you to upload.
Tip: If you ever want to change the background image login to your Twitter account, go to Setting and then Design.
Now select the option you want to use to customize your Twitter background and upload the image you just created. Your new background will be visible in mere seconds.
It may take you several times to get the exact image you want but that is just fine. After all, practice makes perfect!
Of course there are easier ways to customize your Twitter background. There are numerous places online such as Twitter Backs that has already built customized templates and you just basically change them to make them your own. You download the Photoshop files and begin customizing your page. This way is easier for those who are not computer savvy, like me!